Reverse osmosis water purification unit



FIG. 1 is a perspective view of a reverse osmosis water purification unit showing my new design;

FIG. 2 is a top plan view thereof

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a right side elevational view thereof. 

The ornamental design for a reverse osmosis water purification unit, as shown. 